paxman



(No Model.)

' 2 Shets-Sheet 1.. J. N. PAXMAN 82; H. G. PLANE.

STEAM BOILER.

.No. 351,201. FIG'L Patented Oct. 19, 188 6.

2 Sheets-Sheet 2. E.

(No Model.)

J. N. PAXMAN & H. 0-. PLAN STEAM BOILER.

No. 351,201. Patented Oct. 19, 1886.

FIGB.

FI G4.

WITNESSES:

UNITED STATES PATENT @EETQE.

JAMES NOAH PAXMAN AND HENRY GEORGE PLANE, OF GOLCHESTER, COUNTY OF ESSEX, ENGLAND.

STEAM-BOILER.

fiPECIFICATION forming pent of Letters Patent No. 351,201, dated October 19,1886.

Application filed July 12, 1886. Serial No. 207,739. (No model.) Patented in England May 19,1885, No. 6,110, and in Germany December 14, 1885, No. 36,106.

To all whom, it may concern:

Be it known that we, JAMES NOAH PAX- MAN and HENRY GEORGE PLANE, subjects of the Queen of Great Britain, and residing at Colchester, in the county of Essex, England, have invent-ed certain new and useful Iniprovements in Steam-Boilers, (for which we have received Letters Patent in Great Britain, No. 6,110, and dated 19th day of lWIay, 1885, and in Germany, No. 36,106, dated 14th day of December, 1885,) of which the following is a specification.

Our invention relates to the vertical type of steam-boiler, and has for its object the increased efficiency of the boiler by increasing the heating-surface, with further advantage of access for repairs, and also for examining and Cleaning the boiler.

To attain this end we construct our boiler as follows: \Ve construct the outer cylindrical shell of the boiler in the usual manner, and lit inside it, at its lower end, a cylindrical the box of a height equal to about one-third of theheight of the outer shell of the boiler. The lire-box shell, as is usual in this class of boiler, is of a smaller diameter than the outer shell, so as to leave a waterspace between them. The usual opening is made in and 0011- nection made between the two shells for. the lire-box door, and the usual openings are cut in the outer shell for the man and mud holes. So far the construction of our boiler presents no novelties, but the remaining description fully sets forth our invention. Inside the outer shell, immediately above the fire-box, we form opposite to one another a combustion-chamber and a smoke-box, each of a triangular or other suitable shape, the base of each being the inner side of the shell, and the apex pointing toward the center of it. A series of small tubes connect the sides of the combustionchamber and smoke-box with each other, the tubes running nearly circumferentially from chamber to chamber, and preferably slightly inclined, so as to produce a better circulation. A flue connects the top of the fire-box with the combustion-chamber, and the smoke-box isconnected with the funnel, which either runs up outside theboi leraplau we prefer to adopt the smoke-box, whence they pa with small b6ilers-or inside the boiler, passing out through the crown of it, which plan we prefer to adopt with boilers ot' a larger size. In the part of the outer shell forming the bases of the triangular combustion-chamber and smoke-box we form openings into which are fitted doors, that of the combustionchamber being lined with fire'brick. These doors give facilities for cleaning out, withdrawing, replacing, expanding, or recalking the tubes connecting the two chambers. Instead of bending these tubes so that they follow the circumference of the outer shell, they are bent to a greater radius, and are so arranged that they, or any one of them, can be inserted or withdrawn either through the door of the combustion-chamber or through that of the smokebox, which very much facilitates the construction of the boiler and its ultimate maintenance in perfect order. These tubes also offer greater facilities for expansion and contraction than straight ones.

In boilers of such a size that the flue between the fire-box and the combustion chamber is large enough to admit of a man entering the combustion-chamber through the flue, we prefer to make the combustion-chamber detached from the outer shell, so as to allow a waterspace completely round it.

Instead ofhaving a co mbnstion chamber and smoke-box on opposite sides of the boiler, we sometimes form but one chamber and divide it by a partition of brick, metal, or other suitable material, so as to form both a combustionchamber and a s1noke-box,which are then connected with each other by a series of tubes running round the inside of the outer shell. One part of the combustion-chamber is connected with the firebox by a line, and the other is similarly connected with the funnel. It will be seen that the smoke and other pro ducts of combustion after passing out of the lire-box enter the combustion chamber, from which they pass through the series of tubes to say by the funnel.

In order that our invention may be fully understood, we will more particularlydescribe it with the aid of the accompanying drawings,

on which similar parts are marked with like letters of reference.

Figuresl and 2, SheetNo.1, are avertical sec tion and a cross section on line 11 w, respectively, of our improved boiler with a separate combustion-chamber and smoke-box and with an external funnel. Figs. 3 and 4., Sheet No. 2, are a vertical section and a cross-section on line y z, respectively, of our boiler with a divided combustion-chamber and smoke-box.

Referring to these figures, it will be seen that our boiler is constructed with an outer cylindrical shell, A, constructed in the usual manner, and inside it, at its lower end, is a 0 cylindrical fire-box, B, the shell of which (as is usual in this class of boiler) is of a smaller diameter than the outer shell, A, so as to leave a water-space between them. The usual opening is made in and connection made between the two shells for the fire-box door, and the usual openings are cut in the outer shell for the man and mud holes. Inside the outer shell, A, immediately above the firebox B, we form, opposite to one another, a combustiouchamber, G, and a smoke-box, E, each of a triangular or other suitable shape, the base of each triangle being the inner side of the shell, and the apex pointing toward the center of it.- A series of small tubes, dd, &c., connect the sides of the combustion-chamber O and smoke-box E with each other, the tubes (1 d, &c., running nearly circumferentially from one chamber to the other and preferabl y slightly inclined, so as to produce a better circulation. A flue, D, connects the top of the fire-box B with the combustion-chamber 0, while the smoke-box E is connected with the funnel F, which either runs up outside the boiler, as shown in Figs. 1, 2, 3, and 4, or inside the boiler, if found more convenient. In the part of the outer shell, A, forming the sides of the combustion-chamber O and smokebox E we form openings, into which are fitted doors 0 and 0, respectively, the former being preferably lined with tire-brick. These doors give facilities for cleaning out, withdrawing, replacing, expanding, or recalking the tubes connecting the two chambers. Instead of bending the tubes d (Z, &c., so that they follow the circumference of the outer shell, A, they are bent to a larger radius and are so arranged that they can be inserted or withdrawn through the door 0 of the combustion-chamber O, which greatly facilitates the construction of the boiler and its maintenance in perfect order. These bent tubes d d, 850., also offer greater facility for expansion and contraction than straight ones.

In boilers of such a size that the flue D is large enough to admit of a man entering the combustion-chamber 0 through it, we prefer to make the combustion-chamber C detached from the outer shell, A, so as to allow a waterspace completely round it.

Instead of having a combustion-chamber and smoke-box on opposite sides of the boiler, we sometimes form but one chamber and divide it by a partition, G, of brick, metal, or other suitable material, so as to form both a combustion-chamber, O, and smoke-box E, asshown by Figs. 3 and 4. The combustion-chamber and smoke-box are then connected with each other by a series of tubes, d d, &c., running round the inside of the outer shell. The combustion part of the chamber is connected with the fire-box B by a flue, D, and the smoke-box part is connected to the funnel F.

Having now fully described our invention, what we desire to claim and secure by Letters Patent is- 1. In a vertical boiler having an outer shell and an internal fire-box, the combustion-chamber 0, connected to the fire-box B by the line D, and the smoke-box E, connected with the funnel F, and connected also each with the other by the circumferential tubes d d, all combined, arranged, and operating as and for the purpose hereinbefore set forth.

2. In a vertical boiler, the combination of the combustion chamber (3, the smoke-box E, and tubes d d, all arranged and operating specifically as and for the purpose hereinbefore set forth.

3. In a vertical boiler, the tubes d d. of larger radius than the boiler-shell, in combination with the combustion-chamber O and thesmokebox E, whereby the tubes may be withdrawn or replaced, as and for the purpose hereinbefore set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

JAMES NOAH PAXMAN. HENRY GEORGE PLANE.

\Vitnesses:

N. HOLLAWAY, T. H. WEATHERALL, Both clerics to Mr. Henry Goody, Notary Public,

Colchester. 

